of gallarate



(No Model.)

F. MESCHINI.

PRESS. y No. 368,103. l Patented Aug. 9, 1887.

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UNITED STATES FRANCESCO MESOHINI,

j PATENT OEEIcE.

or GALLARATE, ITALY.

PRESS.

SPECIFICATION forming partof Letters Patent No. 368,103, dated August 9, 1,887.

Application filed April 25, 1887. Serial No. 236,130.

' of which the following is a speciiication, reference being had to the accompanying drawings. My improvements relate essentially to presses in which the wheel secured to the nut which acts upon the screw to exert the pressure receives its motion by means of two pawls pivoted to the actuating-lever.

In some'presses of this class the power is limited for the reason that with each revolution of the said wheel a corresponding diminution of volume of thematerial to be pressed takes place, this diminution being measured by a cylinder whose section is the same as that of the screen containing the said material, and whose heightis equal to one thread of the screw of the press. Now the pitch of this thread cannot be diminished beyond a certain limit, either for reasons affecting the construction or withoutan excessive augmentation of friction.

The arrangements heretofore proposed in order to augment the power ofthe press, and consisting-general] y in the addition ofv external wheel mechanism, have failed owing to their complication and their excessive price, and especially to the inconveniencev arising from their employment.

The object of my invention is to avoid the above objection and provide novel means for augmenting the power of the press; to which end the invention consists in the features and combination of devices hereinafter described and claimed. A,

In the accompanying drawings, Figure 41 is a plan of theimproved mechanism. Fig. 2 is a side`view thereof. Fig. 3 is a horizontal section on the line C D of Fig. 2; Fig. 4, a vertical section on theline A B of Fig. 1.

Eis the actuating-lever inserted in the socket F, to which it is secured by means ofa pin, and

(No model.) Patented in Italy December 15, 1885, No. 47; in Spain August 18, 1886, No. 9,130; in France September 10, 1886, No.

175,843, and in Germany November 18, 1886, No. 37,598,

which is capable of turning upon the axis G. H H are thetwo pawls or clicks which oscillate upon their axes k k', and carry. at their extremities steel pins which enter the holes a in the disk or wheel L, which they actuate.

M is the screw of the press.

All the parts are similar in construction to the corresponding parts used in well-known presses of this character, with the exception of the following feature, which is, however, essential. In my improved arrangement the nave of the wheel L, having holes c, is not Y provided with a screw-thread but is bored out cylindrically and is adapted to slide upon the external surface of the screw M with little f riction, andwithout engagingtherewith. The rotation of the wheel L therefore does not directly produce any displacement of the screw M. f

The lower'part, c, of the hub of the disk r wheel L has its exterior surface'turned eccen trically with respect to the screw M. Upon this eccentric part of the said. nave is ar rangedthe pinion N, the lower part of which bears upon a nut, O, whose nave is internally screw-threaded and forms a nut engaging with the threads of the screw M. The nut O is maintained in place by the support or casing P, and consequently it can only turn upon its axis, and cannot lmake any vertical motion of translation.

v The nut O is provided with a recess on its upper surface, into which recess extends the lowerV part of the pinion N. The nut O is also provided with a crown, d, having internal teeth. 'Ihe pitch of these teeth is the same as that of the teeth of the pinion N, so that they can gear together.

The height of the teeth on the pinion N is nearly double that ofthe teeth of the crown d.

-Upon the crown d is supported a ring, e, provided with internal teeth and having the same diameter as the crown d, but the teeth of which have a somewhat different pitch to those of the small, (being reduced, for instance, to a single tooth,) in order that the teeth of d and c can both gear with the pinion N. Y

The bearer or fixed support P has a rim, Q,

and a projection,f, formed in one piece with crown d. This difference, however, is very- `crown d and ring e.

it, and provided with an aperture designed to receive a key, g. By the introduction of this key the toothed ring e is rmly united with the bearer I), and consequently securely fixed. W'hen, on the contrary, thekeyg is withdrawn, the ring e is free to turn loosely around the axis of the screw M.

Fig. 1 shows a second key, h, whlch can be introduced into any of the incisions t', Fig. 3. Vhen this key his in its place, itpasses through the wheel L and the pinion N, and therefore causes this pinion to make the same motions as the wheel L. Thekeys g and h are designed to operate alternately, and must never be insertedin theirrespective apertures atthe same time-that is to say, when g is in its place h must be out of action, and vice versa.

Fig. 4 shows the arrangement for lubricating the various parts of the mechanism, cavities being formed for enabling the introduction of oil.

Having thus completely described the apparatus, it is very easy to comprehend the opera tion of the same. Suppose, first, the key h to be inserted in its aperture and the keyg to be out of action. The wheel L then carries with it in its rotary motion the pinion N. This pinion in turn imparts motion to the toothed crown d and ring e, which rotate around the axis of the screw and cause the movement of the nut O, which is integral with the crown d. All the parts thus participatcin the motion of the wheel L, so that the effect is precisely the same asifthenut O,inlieuofbeingformed separately, were applied directly upon the nave of the wheel Lthat is to say, the operation is the same as that of a Mabille press of ordinary construction. Then the pressure that can be produced in this manner becomes insufficient, the key h must be withdrawn from the aperture t', in which it was inserted, and the keyg introduced into the aperture provided for this purpose in the projection f. The teeth of ring c are then fixed, so that the teeth of the pinion N roll upon the teeth of the ring e, the said pinion being moved by the eccentric part c of the wheel L, the eccentrioity of which part c is equal to the difference between the radii of the pitch-circles of the pinion Nand the ringe. In this rolling motion the teeth of the pinion N engage simultaneously with the teeth in the As, however, the latter is fixed, when the pinion N has made a complete revolution the crown d will have undergone an angular displacement equal to the angle corresponding to the difference between the number of 'its teeth and the number of the teeth of the ring e.

As the crown (Z in its rotation moves the nut O, it follows that by the arrangement described the angular displacement of the said nut can be reduced, by selecting a suitable difference between the number of teeth of the ringeand of the crown d, to one-tenth, one-fifteenth, onctwentieth, or other fraction of the rotation of the disk L, with a proportionate augmentation of the maximum pressure which the press can exert.

I wish it understood that I do not limit myself to the details of construction and arrangement above described, and as represented in the drawings, as it is obvious that I may somewhat modify the same without departing from the nature of my invention. I may communicate to the parts of the epicyeloidal train an additional motion equal and contrary to that of one of its parts, so as -to reduce this part to rest aud obtain differential motions for the others. Thus, for example, gearing can be obtained whose combination with the Mabille ratchet device used iu the presses must be cousidered as comprised in my invention by reducing the motion of the pinion N to simple translation and suppressing the rotary motion which is imparted to it, or by communicating a motion of translation to toothed crowns, and consequently reducing the concentric pinion N to the screw, or by other analogous means.

What I claim is- 1. The combination, with the screw, the nut,

ythe. ratchet-wheel, the pawls, and the pawl-aetuating lever, of the epicycloidal gearing, substantially as described, for imparting a limited angular movement to the nut by one revolution of the ratchet-wheel, for the purposes set forth.

2. The combination, with the screw, the ratchet-Wheel having a smooth nave to rotate freely on the screw, a nut on the screw, the support or bearing P, the pawls, and the pawlaetuating lever, of adifferential orepicycloidal train of gearing arranged in the support or bearing for reducing the angular displacement of the nut when a certain degree of pressure is attained, substantially as and for the purposes described.

In testimony whcreofI have hereunto signed my name in the presence of two subscribing witnesses.

FRANCESCO M ESCHIN I.

Witnesses:

M ARTINUZZI PIETRO, PITToRo VENCESLAO.

IOO 

